Diesels make up about 3% of passanger vehicles on the road.
So out of the thousands of vehicles you see a day you are seeing least dozens of diesel vehicles and don't even realize it.
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 4th Gen disc brake fbody rear end.